\begin{table}
\centering
\begin{tabular}[t]{lccc}
\toprule
  & Model 1 & Model 2 & Model 3\\
\midrule
Gender DG & \num{0.167}** & \num{0.149}** & \num{0.283}\\
 & (\num{0.059}) & (\num{0.035}) & (\num{0.289})\\
IG Type & No & Yes & Yes\\
IG Country & No & Yes & Yes\\
Policy Area & No & No & Yes\\
IG Covs & No & Yes & Yes\\
Number of Observations & 21081 & 18118 & 18118\\
\bottomrule
\multicolumn{4}{l}{\rule{0pt}{1em}+ p $<$ 0.1, * p $<$ 0.05, ** p $<$ 0.01, *** p $<$ 0.001}\\
\multicolumn{4}{l}{\rule{0pt}{1em}Significance levels: *** p $<$ 0.01, ** p $<$ 0.05, * p $<$ 0.1}\\
\end{tabular}
\end{table}
